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Light Conversion Harpia: Off-the-Shelf Pump-Probe Spectrometer

harpia

  • 350 – 1100 nm probe wavelength range
  • Ample sample space to fit a cryostat or flow system
  • Beam monitoring and self‑recalibration
  • Simple integration of any user‑preferred external spectrograph
  • Transient absorption and Z-scan experiments on the same device

The popular transient absorption spectrometer HARPIA from Light Conversion has been reimagined and redesigned to meet the needs and standards of today's scientific world. The new and improved HARPIA offers a sleek and compact design and a more intuitive user experience and easy day‑to‑day maintenance. Adhering to the standards raised by the OPRHEUS line of devices, the entire spectroscopic system is now contained in a single monolithic aluminum casing that inherently ensures excellent optical stability and minimal optical path for the interacting beams.

In contrast to its predecessor, the dimensions of the device are greatly reduced – the area is reduced roughly 2.6x, whereas volume is reduced nearly 4x. The new HARPIA can be easily integrated with both PHAROS / ORPHEUS and Ti:Sapph / TOPAS laser systems. Just like its precursor, it features market leading characteristics such as 10-5 resolvable signals along with other unique properties such as the ability to work at high repetition rates (up to 1 MHz) when used with PHAROS / ORPHEUS system. High repetition rate allows measuring transient absorption dynamics while exciting the samples with extremely low pulse energies (thereby avoiding exciton annihilation effects in energy transferring systems or nonlinear carrier recombination in semiconductor / nanoparticle samples).

Harpia inside

A number of probe configurations and detection options are available starting with simple and cost effective photodiodes for single wavelength detection and ending with spectrally-resolved broadband detection combined with white light continuum probing. Data acquisition and measurement control are now integrated within the device itself and offer such improved detection capabilities as:

  • Single (sample-only) or multiple (sample and reference) integrated spectral detectors;
  • Simple integration of any user-preferred external spectrograph;
  • Beam monitoring and self-recalibration capabilities (both along the optical path of the pump/probe beams and at the sample plane) and an option for automated beam readjustment;
  • Straightforward switching between transient absorption or transient reflection measurements;
  • Capability to combine both transient absorption and Z-scan experiments on the same device;

Moreover different delay line options can be selected to cover delay windows from 2 ns (standard) to 4 ns and HARPIA may house either standard linear leadscrew (20 mm/s) or fast ball-screw (300 mm/s) optical delay stages.

Harpia simplified

A number of optomechanical peripherals are now compactly enclosed in the HARPIA casing, including:

  • An optical chopper that can either phase-lock itself to any multiple of the frequency of the laser system or operate in a free-running internally-referenced regime (standard);
  • Motorized and calibrated Berek’s polarization compensator that can automatically adjust the polarization of the pump beam (optional);
  • Motorized transversely translatable supercontinuum generator (applicable for safe and stable supercontinuum generation in materials such as CaF2 or MgF2; optional);
  • Automated sample raster scanner that translates the sample in the focal plane of the pump and probe beams, thus avoiding local sample overexposure (optional).

Moreover, the new HARPIA is designed to be compatible with any user-favored cryostat and/or peristaltic pump system (see mounting sheme).

A new and improved user application with experiment-guiding wizards, measurement presets, and development kit for custom applications. In addition to experiment automation software, HARPIA includes data analysis package CarpetView for inspecting the acquired data and performing global and target analysis, probe dispersion compensation, exponential fitting etc. The software package features an intuitive and user friendly interface; it is delivered with a data analysis tutorial that offers seamless transition from the raw data to publication quality graphs and model based parameter estimation. All the software runs under MS Windows and it is easy to use. Even a novice will become an analysis expert in a matter of days!

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